parse URI to URI object like location object。URI转换，secheme转换

parseURI.js

function parseURI (uri) {
            "use strict";
            if (!uri) return;

            var regexMaybe = function (str) {
                    return '(?:' + str + ')?';
                },
                reg = new RegExp('^' + regexMaybe('(([^:]+):)?') + '\\/\\/([^:/]+)/*' + regexMaybe(':(\\d+)\\/*') + regexMaybe('([^?#]+)') + regexMaybe('\\?([^#]+)') + regexMaybe('#(\\w+)')),
                match = uri.match(reg),
                protocol = match[1] || '',
                hostname = match[3] || '',
                port = match[4] || '',
                host = hostname + ':' + port,
                origin = protocol + '//' + host,
                pathname = match[5] || '',
                search = match[6] || '',
                hash = match[7] || '';

            return {
                protocol: protocol,
                hostname: hostname,
                port: port,
                host: host,
                origin: origin,
                pathname: pathname,
                href: uri,
                search: search,
                hash: hash
            };
        }